Use the database tables below to answer the following questions. 
-Which table's primary key has a composite primary key?
Definitions:
Federal Action
Formal measures or interventions taken by the federal government, usually implying legislation, regulations, or legal proceedings.
Clean Water Act
United States federal law aimed at reducing pollution in the nation's waterways and regulating the discharge of pollutants.
Discharge of Pollutants
Refers to the release of contaminants or pollutants into the environment, including air, water, and soil, often regulated by environmental laws.
Point-source Water Pollution
Contamination of water bodies originating from identifiable sources, such as pipes, ditches, or specific discharge points.
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